Rotary knife-grinder.



1-,o'mssso N. DU BRUL. ROTARY KNIFE GBINDEB. APPLICATION TILED SEPT.11, 1912.

Patented Nov. 4, 1913.

3 SHEETS-SHEET 1.

N. DU BRUL.

ROTARY KNIFE GRINDER.

APPLIGATION FILED SEPT. 11, 1912.

Patented Nov. 4, 1913.

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wummm 1%? APPLICATION FILED SEPT.11, 1912.

l l l llll llll N. DU BRUL.

ROTARY KNIFE GRINDER.

Patented NOV. 4, 1913;

3 SHEETS-SHEET 3.

.in order to maintain NAPOLEON DU BRU'L, OF CINCINNATI, OHIO, ASSIGNOR TO THE PETERS MANUFACTURING CQMBAN OHIO.

MILLER, DU" BRUL AND or CINCINNATI, 01110, a conrozmrron or ROTARY KN IFE-G-RINDER.

Specification of Letters Patent.

Patented Nov. 4, 1913.

Application filed September 11, 1912. Serial No. 719,881.

To all whom it may concern:

Be it known that I, NAPOLEON DU BRUL, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of .Ohio, have invented certain new and useful Improvements in Knife-Grinders, specification.

This invention relates to devices for grinding circular knives which rotate in performing their function, asfor example the severing knives of continuous cigarette machines, their edges in proper condition; and more particularly to that type of such knives, in which there is a reciprocating movement of the knife (straight line, orbital, or both) incident to its cutting stroke.

One object of the invention isto grind the blade on both faces, but to develop the greater portion of the grinding on one face, preferably at a substantial angle to the plane of the blade, and only suiiicient grinding on the other side, preferably in substantially the plane of the face, to remove the bar or rough edge left by the main grinding.

nother object is to employ the reciprocation of the knife, either edgewise or axially, but preferably both, and either in a straight line or in an orbital path, but preferably both, to cause opposite faces of the knife to impinge against grinders suitably positioned to receive the respective knife faces as the ife reaches the limits of its movements.

Further objects relate to certain adjustments of the grinders, namely, an adjustment toward the axis of the knife to compensate for wearing away of the knife incident to continued grlnding; an adjustment of the grinder toward the knife face to be ground in order to develop exactly the grinding pressure desired; and an adjustment of the of which the following is a grinder in angular relation to the blade in' order to determine the bevel of the main grinding.

The invention will be fully understood .upon referenceto the accompanying drawings which disclose one embodiment of the several features of the present invention by way of illustration, and in which Figure I is a plan view of an orbital knife severing device for subdividin a rod fed ing the present invention Rotary in a plane parallel to Fig. 5.

stantly. For this Fig. 2 is a detail plan view of the two grinders shown in Fig. 1. Fig. 3 is a section on the line 33 of Fig. 1. Fig. 4 is a rear end view of Figs. 1 and 2. Fig. 5 is a detail view of the mounting for the grinder in elevation. Fig. 6 is a vertical section of the same Fig. 7 is a vertical sectionof the same in a'plane perpendicular to Figs. 5 and 6. Fig-8'is adetail view of the mounting for the second grinder. Fi 9 is a horizontal section of parts shown 1n Fig. 7.

Referring more and 4, 1 represents a circular knife journ'aled on the crank 2 of a shaft 3 which is rotated through the pinion 4 from any'suitable source, to cause the knife 1 to periodically intersect the severing tube 5 through which a. continuous rod is being fed. By a cam 6 on the shaft 3, engaging between studs 7 on a fixed part the axial reciprocation which coincides with the feed of the rod so long as the knife is intersecting the tube. Thus the knife has re ciprocation, both axially and orbit-ally. These parts constitute the invention of another.

In order to keep the circular knife sharp, its edge should be ground more or less conpurpose a grinder 8 is located in osition. to be impinged against by the knifie of its throw. This grinder assumes a position at a substantial angle to the plane-of the knife so as to maintain a bevel for obvious reasons. But grinding the edge from one side develops a bur or roughness which would seriously interfere with the sharpness of the knife. Hence I employ a second grinder 9 located in'position to be impinged by the opposite face of the knife when at the outer limit of its reciprocation. since the grinder 9 need only grind the knife sufficiently to remove the bur it is placed substantially parallel to the knife. A pair of grinders are thus provided, against wh1ch the respective faces of the knife reciprocate. The grinder 9 is slightly in the advance of the grinder 8 for thereason that the knife has moved forward when it has reached that end of its throw. contmuously past the cutting po1nt,an d hav- As will hereinafter appear the mounting applied thereto. I

shaft 3 1s given an.

as the latter reaches the end.

particularly to Figs. 1, 3

10 for main grinder 8 is adjustably anchored to the machine bed 11 by a tie bolt 12 entering slot 12 in said bed whereas the second grinder mounting 13 is adjustably secured to the bed 11 by clamping bolt 14 entering slot 14: in the mounting 13. Each grinder is thus adjustable toward the axis of the knife to compensate for gradual reduction in the diameter of the knife.

The main grinder 8 is mounted upon a shaft 15 journaled inbushing 16 which is fitted to slide axially in the mounting 10 and has an arm 17 working in a slot 18 in said mounting to prevent the bushing rotating, while a screw 19 shouldered in a lug 20 on the mounting, is threaded into the arm 17, and thus provides for adjusting the grinder to or from the k nifeland therefore regulating the grinding pressure at will. A set screw 21 firmly locks these parts at their adjustment. Similarly, the secondarygrinder 9 is mounted on shaft 15 journaled in sleeve 16 fitted to slide axially in the mounting 10, and having an arm 17* working in slot 18 insaid mounting to prevent the bushing rotating, while screw 19 shouldered in lug 20 on the mounting, the arm 17 to provide for adjusting the grinding pressure of the secondary grinder to a nicety. Set screw 21 holds these parts in their adjustment.

The primary grinder has one other adjustment, namely to change its angular relation to the plane of the knife, for which purpose its mounting is divided into the base 10 and head 10", fixed coaxially by a vertical trunnion 22 '(Figs. 6 and 7 on the head depending into the socket 23 on the base and adapted to be locked against separation as well as against displacement from the angular adjustment, by the set screw 24:.

To drive the grinders, any suitable connection may be employed. I have herein. shown a shaft 25, which may be the main shaft of the machine; large ulleys 26, 26 on said main shaft; driven pulleys 27, 27 a carrieddoy short shafts 28, 28 and belted to pulleys 26, 26; transmitting pulleys 29, 29 -on said short shafts; and pulleys 30, 30 on the grinder shafts 15, 15 and belted to the pulleys 29, 29. Shafts 28, 28 are'mounted to be adjusted in order to maintain the distance between the pulleys 29-30, and 29-.30 notwithstanding adjustments in the grinder mountings, and also to keep the belt taut, as for instance by mounting the shaft 28 in the singularly adjust-able arm 31' on the main shaft, or by mounting the shaft 28 upon the arm 32 which projects outward from and is adjustably bolted at 33 to the machine frame or bed .11 as shown in Figs. 1 and 3.

I claim:

-1. In combination with a mounting for a rotary machine knife having a reciprocation is threaded in -mounting for a rotary in a transverse direction of the knife, a pair of grinders positioned to be impinged against by opposite faces of the knife when'said knife is being reciprocated by said mounting.

2. In combination with a mounting for a machine knife, said mounting having reciprocations during operation in two directions perpendicular to each other, a pairof grinders respectively located to be impinged against by a knife on said mounting, sai knife partaking of said reciprocations.

8. In combination with a mounting for a machine knife having an edgewise orbital movement and an 'axial reciprocation in the plane of an axis of its orbit'; a pair of grinders located at the ends of the said orbital axis and offset in the said orbital plane, by the distance of the said axial reciprocation, whereby the said grinders are impinged against by the respective outer faces of the relative to the axis said knife as when at the limit of the-said movements.

4. In combination with a mounting for a machine knife having a reciprocating movement during operation, a pai of grinders located to be impinged against by therespective outer faces of said knife by the reciprocation of said mounting; the grinding face of one of said grinders being held at a substantial angle to the plane of the knife,

whereby. it grinds a bevel at the edge, and the other having its grinding faces substantially parallel to the plane of the knife; means being provided to rotate each of said grinders, and one of said grinders being rotated more rapidly than the others.

5. In combination with a mounting for a machine knife having a reciprocating move- -ment, 2. pair of grinders positioned to be'impinged against by opposite faces of the knife, in the reciprocation of said mounting; both xof said grinders being adjustable to ward the axis of said knife.

6. In combination with a reciprocating mounting for a machine knife having a reciprocating movementduringb operation; a pair of grinders positioned to e impinged against by opposite faces of the knife, in the reciprocation of said mounting; means being provided to advance a grinder toward the axis of the knife, as the knife. reduces in diameter and also to adjust the rinder toward the knife-face which it grinds.

7 In combination with a reciprocating knife, a grinder having adjustment toward the axis of the knife, an adjustment toward the knife-face which it grinds and adjustment in an angular relation to the plane of the knife. v

8. In combination with a mounting for a rotary knife having a reciprocating movement during operation; a rotary grinder located to be impinged against by said knife, in its reciprocation; said grinder having a mounting comprising a base and a head 'in movemen't,and a set screw for axially adwhich the grinder is journaled, connected to justing the bushing in the head. 25 said base through means of a vertical trun- 11. n combination with a reciprocating nion.

. mounting for a rotary knife, a rotary grinder 9. In combination with a mounting for a against which said knife is adapted to imrotary knife havin a reciprocating movepinge, and a mounting for said grinder ment; a rotary grlnder located to be imcomprising a shaft, a bushing in which said 30 pinged against by said knife, in its reciproshaft is ournaled, a head in which said cation; said grinder having a mounting combushing is fitted with axial movement, and a prising a baseand a head in which the set screw for axially adjusting the bushing grinder is journaled, connected to said base in theh'ead; said bushing having a radial through means of a vertical trunnion; there arm fittin a lateral opening in the head, bein a bed on which the grinder mounting and in whlch the adjusting screw is threadis a justably supported, and a tie bolt exed, and said head having a lug in which the tending through said bed and through both screw i 'shouldered with freedom of rotathe base and head of said grinder mounting. tion.

10. In combination with a reciprocating The foregoing specification signed at Cinmounting for a rotary knife, having a rocinati Ohio thls twenty-sixth day of Autary grinder against which said \knife is gust, 1912.

adapted to impinge, and a mounting for aid NAPOLEON DU BRUL. grinder comprising a shaft, a bushin in Witnesses:

which said shaft is journaled, a hea in E. F. DU BRUL,

which said bushing is fitted with axial F. CHUDOBA. 

